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1
11 package org.eclipse.jface.text.templates;
12
13 import java.util.ArrayList  ;
14 import java.util.Collections ;
15 import java.util.Comparator ;
16 import java.util.List ;
17
18 import org.eclipse.swt.graphics.Image;
19
20 import org.eclipse.jface.text.BadLocationException;
21 import org.eclipse.jface.text.IDocument;
22 import org.eclipse.jface.text.IRegion;
23 import org.eclipse.jface.text.ITextSelection;
24 import org.eclipse.jface.text.ITextViewer;
25 import org.eclipse.jface.text.Region;
26 import org.eclipse.jface.text.contentassist.ICompletionProposal;
27 import org.eclipse.jface.text.contentassist.IContentAssistProcessor;
28 import org.eclipse.jface.text.contentassist.IContextInformation;
29 import org.eclipse.jface.text.contentassist.IContextInformationValidator;
30
31
32
39 public abstract class TemplateCompletionProcessor implements IContentAssistProcessor {
40
41 private static final class ProposalComparator implements Comparator {
42 public int compare(Object o1, Object o2) {
43 return ((TemplateProposal) o2).getRelevance() - ((TemplateProposal) o1).getRelevance();
44 }
45 }
46
47 private static final Comparator fgProposalComparator= new ProposalComparator();
48
49
53 public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int offset) {
54
55 ITextSelection selection= (ITextSelection) viewer.getSelectionProvider().getSelection();
56
57 if (selection.getOffset() == offset)
59 offset= selection.getOffset() + selection.getLength();
60
61 String prefix= extractPrefix(viewer, offset);
62 Region region= new Region(offset - prefix.length(), prefix.length());
63 TemplateContext context= createContext(viewer, region);
64 if (context == null)
65 return new ICompletionProposal[0];
66
67 context.setVariable("selection", selection.getText());
69 Template[] templates= getTemplates(context.getContextType().getId());
70
71 List matches= new ArrayList ();
72 for (int i= 0; i < templates.length; i++) {
73 Template template= templates[i];
74 try {
75 context.getContextType().validate(template.getPattern());
76 } catch (TemplateException e) {
77 continue;
78 }
79 if (template.matches(prefix, context.getContextType().getId()))
80 matches.add(createProposal(template, context, (IRegion) region, getRelevance(template, prefix)));
81 }
82
83 Collections.sort(matches, fgProposalComparator);
84
85 return (ICompletionProposal[]) matches.toArray(new ICompletionProposal[matches.size()]);
86 }
87
88
104 protected ICompletionProposal createProposal(Template template, TemplateContext context, Region region, int relevance) {
105 return createProposal(template, context, (IRegion) region, relevance);
106 }
107
108
123 protected ICompletionProposal createProposal(Template template, TemplateContext context, IRegion region, int relevance) {
124 return new TemplateProposal(template, context, region, getImage(template), relevance);
125 }
126
127
133 protected abstract Template[] getTemplates(String contextTypeId);
134
135
144 protected TemplateContext createContext(ITextViewer viewer, IRegion region) {
145 TemplateContextType contextType= getContextType(viewer, region);
146 if (contextType != null) {
147 IDocument document= viewer.getDocument();
148 return new DocumentTemplateContext(contextType, document, region.getOffset(), region.getLength());
149 }
150 return null;
151 }
152
153
161 protected abstract TemplateContextType getContextType(ITextViewer viewer, IRegion region);
162
163
173 protected int getRelevance(Template template, String prefix) {
174 if (template.getName().startsWith(prefix))
175 return 90;
176 return 0;
177 }
178
179
189 protected String extractPrefix(ITextViewer viewer, int offset) {
190 int i= offset;
191 IDocument document= viewer.getDocument();
192 if (i > document.getLength())
193 return "";
195 try {
196 while (i > 0) {
197 char ch= document.getChar(i - 1);
198 if (!Character.isJavaIdentifierPart(ch))
199 break;
200 i--;
201 }
202
203 return document.get(i, offset - i);
204 } catch (BadLocationException e) {
205 return ""; }
207 }
208
209
215 protected abstract Image getImage(Template template);
216
217
220 public IContextInformation[] computeContextInformation(ITextViewer viewer, int documentOffset) {
221 return null;
222 }
223
224
227 public char[] getCompletionProposalAutoActivationCharacters() {
228 return null;
229 }
230
231
234 public char[] getContextInformationAutoActivationCharacters() {
235 return null;
236 }
237
238
241 public String getErrorMessage() {
242 return null;
243 }
244
245
248 public IContextInformationValidator getContextInformationValidator() {
249 return null;
250 }
251 }
252 |
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